Electrical field of an equialateral triangle

1. The problem statement, all variables and given/known data
An equilateral triangle is formed with 3 rods, each with a length of 10cm. Two of them carry a charge of +63nC and 1 carries a charge of -63nC. The charge is uniformly distributed along each rod. What is the magnitude of the electric field at the center of the triangle?

2. Relevant equations
E_Rod = KQ / (d*sqrt(d^2 * (L/2)^2))

3. The attempt at a solution
Center of triangle is 4.33cm, or .0433m from each rod.